SIST EN IEC 62271-204:2022

High-voltage switchgear and controlgear - Part 204: Rigid gas-insulated transmission lines for rated voltage above 52 kV (IEC 62271-204:2022)

This part of IEC 62271 applies to rigid HV gas-insulated transmission lines (GIL) in which the insulation is obtained, at least partly, by a non-corrosive insulating gas, other than air at atmospheric pressure, for alternating current of rated voltages above 52 kV, and for service frequencies up to and including 60 Hz. It is intended that this international standard shall be used where the provisions of IEC 62271-203 do not cover the application of GIL (see Note 3).
At each end of the HV gas-insulated transmission line, a specific element may be used for the connection between the HV gas-insulated transmission line and other equipment like bushings, power transformers or reactors, cable boxes, metal-enclosed surge arresters, voltage transformers or GIS, covered by their own specification.
Unless otherwise specified, the HV gas-insulated transmission line is designed to be used under normal service conditions.
Note 1 to entry: In this international standard, the term "HV gas-insulated transmission line" is abbreviated to "GIL".
Note 2 to entry: In this international standard, the word "gas" means gas or gas mixture, as defined by the manufacturer.
Note 3 to entry: Examples of GIL applications are given:
- where all or part of the HV gas-insulated transmission line is directly buried; or
- where the HV gas-insulated transmission line is located, wholly or partly, in an area accessible to public; or
- where the HV gas-insulated transmission line is long (typically longer than to 500 m) and the typical gas compartment length exceeds the common practice of GIS technology.

Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 204: Starre gasisolierte Übertragungsleitungen für Bemessungsspannungen über 52 kV (IEC 62271-204:2022)

Appareillage à haute tension - Partie 204: Lignes de transport rigides à isolation gazeuse de tension assignée supérieure à 52 kV (IEC 62271-204:2022)

IEC 62271-204:2022 est disponible sous forme de IEC 62271-204:2022 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

L’IEC 62271-204:2022 est applicable aux lignes de transport rigides haute tension à isolation gazeuse (LIG) dont l’isolation est réalisée, au moins partiellement, par un gaz isolant ou un mélange gazeux autre que l’air à la pression atmosphérique, pour un courant alternatif de tension assignée supérieure à 52 kV, pour des fréquences de service inférieures ou égales à 60 Hz. Cette deuxième édition annule et remplace la première édition parue en 2011. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- mise à jour par rapport à l’IEC 62271-1:2017 et alignement des caractéristiques assignées de tension et des tensions d’essai;
- ajout de nouvelles informations relatives aux soudures sur les parties sous pression et à l’étanchéité au gaz.

Visokonapetostne stikalne in krmilne narave - 204. del: Togi plinsko izolirani prenosni vodi za naznačene napetosti nad 52 kV (IEC 62271-204:2022)

Ta del standarda IEC 62271 se uporablja za toge visokonapetostne plinsko izolirane prenosne vode (GIL), ki so vsaj delno izolirani z nekorozivnim izolirnim plinom, drugačnim od zraka pri atmosferskem tlaku, za izmenični tok naznačenih napetosti nad 52 kV in za delovne frekvence do vključno 60 Hz. Ta mednarodni standard je treba uporabiti, kadar določbe iz standarda IEC 62271-203 ne zajemajo uporabe togih visokonapetostnih plinsko izoliranih prenosnih vodov (glej opombo 3).
Na vsakem koncu visokonapetostnega plinsko izoliranega prenosnega voda se lahko uporabi poseben element za povezovanje tega voda z drugo opremo, kot so puše, močnostni transformatorji ali reaktorji, kabelske škatle, prenapetostni odvodniki v kovinskem ohišju, napetostni transformatorji ali plinsko izolirane stikalne naprave, za katere veljajo njihove lastne specifikacije.
Če ni določeno drugače, je visokonapetostni plinsko izolirani prenosni vod zasnovan za uporabo v običajnih pogojih delovanja.
Opomba 1: V tem mednarodnem standardu se za izraz »visokonapetostni plinsko izolirani prenosni vod« uporablja kratica »GIL«.
Opomba 2: V tem mednarodnem standardu beseda »plin« pomeni plin ali plinsko mešanico v skladu z opredelitvijo proizvajalca.
Opomba 3: Primeri uporabe visokonapetostnih plinsko izoliranih prenosnih vodov so podani:
– kadar je visokonapetostni plinsko izolirani prenosni vod neposredno zakopan; ali
– kadar je visokonapetostni plinsko izolirani prenosni vod delno ali v celoti na javno dostopnem območju; ali
– kadar je visokonapetostni plinsko izolirani prenosni vod dolg (običajno daljši od 500 m) in tipična dolžina plinskih pregrad presega tisto, ki jo predvideva ustaljena praksa na področju tehnologije plinsko izoliranih stikalnih naprav.

General Information

• Status: Published
• Publication Date: 04-Sep-2022
• ICS: 29.130.10 - High voltage switchgear and controlgear
• Technical Committee: SKA - Switchgear and control gear
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 27-Jul-2022
• Due Date: 01-Oct-2022
• Completion Date: 05-Sep-2022
• Ref Project: EN IEC 62271-204:2022 - High-voltage switchgear and controlgear - Part 204: Rigid gas-insulated transmission lines for rated voltage above 52 kV

Relations

• Revised: SIST EN 62271-204:2011 - High-voltage switchgear and controlgear - Part 204: Rigid high-voltage, gas-insulated transmission lines for rated voltages of 72,5 kV and above (IEC 62271-204:2011)
• Effective Date: 17-Sep-2019
• Replaces: SIST EN 62271-204:2011 - High-voltage switchgear and controlgear - Part 204: Rigid high-voltage, gas-insulated transmission lines for rated voltages of 72,5 kV and above (IEC 62271-204:2011)
• Effective Date: 12-Jul-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 62271-204:2022
01-oktober-2022
Nadomešča:
SIST EN 62271-204:2011
Visokonapetostne stikalne in krmilne narave - 204. del: Togi plinsko izolirani
prenosni vodi za naznačene napetosti nad 52 kV (IEC 62271-204:2022)

High-voltage switchgear and controlgear - Part 204: Rigid gas-insulated transmission

lines for rated voltage above 52 kV (IEC 62271-204:2022)
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 204: Starre gasisolierte
Übertragungsleitungen für Bemessungsspannungen über 52 kV (IEC 62271-204:2022)

Appareillage à haute tension - Partie 204: Lignes de transport rigides à isolation gazeuse

de tension assignée supérieure à 52 kV (IEC 62271-204:2022)
Ta slovenski standard je istoveten z: EN IEC 62271-204:2022
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
SIST EN IEC 62271-204:2022 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 62271-204:2022
---------------------- Page: 2 ----------------------
SIST EN IEC 62271-204:2022
EUROPEAN STANDARD EN IEC 62271-204
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2022
ICS 29.130.10 Supersedes EN 62271-204:2011
English Version
High-voltage switchgear and controlgear - Part 204: Rigid gas-
insulated transmission lines for rated voltage above 52 kV
(IEC 62271-204:2022)

Appareillage à haute tension - Partie 204: Lignes de Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil

transport rigides à isolation gazeuse de tension assignée 204: Starre gasisolierte Übertragungsleitungen für

supérieure à 52 kV Bemessungsspannungen über 52 kV
(IEC 62271-204:2022) (IEC 62271-204:2022)

This European Standard was approved by CENELEC on 2022-07-05. CENELEC members are bound to comply with the CEN/CENELEC

Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC

Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation

under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62271-204:2022 E
---------------------- Page: 3 ----------------------
SIST EN IEC 62271-204:2022
EN IEC 62271-204:2022 (E)
European foreword

The text of document 17C/840/FDIS, future edition 2 of IEC 62271-204, prepared by SC 17C

"Assemblies" of IEC/TC 17 "High-voltage switchgear and controlgear" was submitted to the IEC-

CENELEC parallel vote and approved by CENELEC as EN IEC 62271-204:2022.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2023-04-05

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2025-07-05

document have to be withdrawn

This document supersedes EN 62271-204:2011 and all of its amendments and corrigenda (if any).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Any feedback and questions on this document should be directed to the users’ national committee. A

complete listing of these bodies can be found on the CENELEC website.
Endorsement notice

The text of the International Standard IEC 62271-204:2022 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60071-1 NOTE Harmonized as EN IEC 60071-1
ISO 5817 NOTE Harmonized as EN ISO 5817
ISO 6520 (series) NOTE Harmonized as EN ISO 6520 (series)
ISO 10042 NOTE Harmonized as EN ISO 10042
ISO 10675-1 NOTE Harmonized as EN ISO 10675-1
ISO 10675-2 NOTE Harmonized as EN ISO 10675-2
ISO 10893-8 NOTE Harmonized as EN ISO 10893-8
ISO 10893-9 NOTE Harmonized as EN ISO 10893-9
ISO 10893-10 NOTE Harmonized as EN ISO 10893-10
ISO 10893-11 NOTE Harmonized as EN ISO 10893-11
ISO 11666 NOTE Harmonized as EN ISO 11666
ISO 17640 NOTE Harmonized as EN ISO 17640
IEC 60270 NOTE Harmonized as EN 60270
ISO 22825 NOTE Harmonized as EN ISO 22825
ISO 23279 NOTE Harmonized as EN ISO 23279
---------------------- Page: 4 ----------------------
SIST EN IEC 62271-204:2022
EN IEC 62271-204:2022 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the

relevant EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available

here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60060-1 2010 High-voltage test techniques - Part 1: EN 60060-1 2010
General definitions and test requirements
IEC 60068-1 2013 Environmental testing - Part 1: General EN 60068-1 2014
and guidance
IEC 60229 2007 Electric cables - Tests on extruded EN 60229 2008
oversheaths with a special protective
function
IEC 60287-3-1 2017 Electric cables - Calculation of the current - -
rating - Part 3-1: Operating conditions -
Site reference conditions
IEC 60376 - Specification of technical grade sulfur EN IEC 60376 -
hexafluoride (SF ) and complementary
gases to be used in its mixtures for use in
electrical equipment
IEC 60480 - Specifications for the re-use of sulphur EN IEC 60480 -
hexafluoride (SF ) and its mixtures in
electrical equipment
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code)
- - + corrigendum May 1993
+ A1 1999 + A1 2000
+ A2 2013 +A2 2013
+AC 2016-12
+AC 2019-02
IEC 62271-1 2017 High-voltage switchgear and controlgear - EN 62271-1 2017
Part 1: Common specifications for
alternating current switchgear and
controlgear
IEC 62271-4 2013 High-voltage switchgear and controlgear - EN 62271-4 2013
Part 4: Handling procedures for sulphur
hexafluoride (SF6) and its mixtures
---------------------- Page: 5 ----------------------
SIST EN IEC 62271-204:2022
EN IEC 62271-204:2022 (E)
IEC 62271-203 2022 High-voltage switchgear and controlgear - - -
Part 203: AC gas-insulated metal-enclosed
switchgear for rated voltages above 52 kV
ISO 9606 series Qualification test of welders - Fusion EN ISO 9606 series
welding
ISO 9712 - Non-destructive testing - Qualification and EN ISO 9712 -
certification of NDT personnel
ISO 14732 - Welding personnel - Qualification testing of EN ISO 14732 -
welding operators and weld setters for
mechanized and automatic welding of
metallic materials
ISO 15609 series Specification and qualification of welding EN ISO 15609 series
procedures for metallic materials - Welding
procedure specification
ISO 15614 series Specification and qualification of welding EN ISO 15614 series
procedures for metallic materials - Welding
procedure test
---------------------- Page: 6 ----------------------
SIST EN IEC 62271-204:2022
IEC 62271-204
Edition 2.0 2022-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 204: Rigid gas-insulated transmission lines for rated voltage above 52 kV
Appareillage à haute tension –
Partie 204: Lignes de transport rigides à isolation gazeuse de tension assignée
supérieure à 52 kV
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-3804-2

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 62271-204:2022
– 2 – IEC 62271-204:2022 © IEC 2022
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 6

4 Normal and special service conditions ............................................................................. 8

5 Ratings ............................................................................................................................ 9

6 Design and construction ................................................................................................ 10

7 Type tests ..................................................................................................................... 21

8 Routine tests ................................................................................................................. 28

9 Guide to the selection of GIL (informative) ..................................................................... 29

10 Information to be given with enquiries, tenders and orders (informative) ........................ 30

11 Transport, storage, installation, operating instructions and maintenance........................ 32

12 Safety ............................................................................................................................ 38

13 Influence of the product on the environment .................................................................. 39

Annex A (informative) Estimation of continuous current ....................................................... 40

Annex B (informative) Earthing ............................................................................................ 45

Annex C (informative) Long-term testing of buried installations ............................................ 49

Annex D (normative) Requirements for welds on pressurized parts ...................................... 51

Bibliography .......................................................................................................................... 53

Figure B.1 – Example of earthing system together with active anti-corrosion system in

the case of solid bonding of the enclosure at both ends ........................................................ 48

Table 1 – Second characteristic numeral of IP coding ........................................................... 14

Table D.1 – Quantity of NDTs ............................................................................................... 51

Table D.2 – Acceptance criteria of imperfections .................................................................. 52

---------------------- Page: 8 ----------------------
SIST EN IEC 62271-204:2022
IEC 62271-204:2022 © IEC 2022 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 204: Rigid gas-insulated transmission lines
for rated voltage above 52 kV
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international

co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

rights. IEC shall not be held responsible for identifying any or all such patent rights.

IEC 62271-204 has been prepared by subcommittee 17C: Assemblies, of IEC technical

committee 17: High-voltage switchgear and controlgear. It is an International Standard.

This second edition cancels and replaces the first edition published in 2011. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) update to be in line with IEC 62271-1:2017 and alignment of the voltage ratings and the test

voltages.
b) addition of new information for welds on pressurized parts and gas tightness.
---------------------- Page: 9 ----------------------
SIST EN IEC 62271-204:2022
– 4 – IEC 62271-204:2022 © IEC 2022
The text of this document is based on the following documents:
Draft Report on voting
17C/840/FDIS 17C/846/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in greater detail at www.iec.ch/standardsdev/publications.

This document is to be read in conjunction with IEC 62271-1:2017 and IEC 62271-203:2022, to

which it refers and which are applicable unless otherwise specified. In order to simplify the

indication of corresponding requirements, the same numbering of clauses and subclauses is

used as in IEC 62271-1:2017 and IEC 62271-203:2022. Amendments to these clauses and

subclauses are given under the same numbering, whilst additional subclauses are numbered

from 101.

A list of all parts of the IEC 62271 series can be found, under the general title High-voltage

switchgear and controlgear, on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under webstore.iec.ch in the data related to the

specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 10 ----------------------
SIST EN IEC 62271-204:2022
IEC 62271-204:2022 © IEC 2022 – 5 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 204: Rigid gas-insulated transmission lines
for rated voltage above 52 kV
1 Scope

This part of IEC 62271 applies to rigid HV gas-insulated transmission lines (GIL) in which the

insulation is obtained, at least partly, by an insulating gas or gas mixture other than air at

atmospheric pressure, for alternating current of rated voltages above 52 kV, and for service

frequencies up to and including 60 Hz.

This document is applicable where the provisions of IEC 62271-203 do not cover the application

of GIL (see Note 3).

At each end of the HV gas-insulated transmission line, a specific element is used for the

connection between the HV gas-insulated transmission line and other equipment like bushings,

power transformers or reactors, cable boxes, metal-enclosed surge arresters, voltage

transformers or GIS, covered by their own specification.

Unless otherwise specified, the HV gas-insulated transmission line is designed to be used under

normal service conditions.

NOTE 1 In this document, the term "HV gas-insulated transmission line" is abbreviated to "GIL".

NOTE 2 In this document, the word "gas" means gas or gas mixture, as defined by the manufacturer.

NOTE 3 Examples of GIL applications:

– where all or part of the HV gas-insulated transmission line is directly buried;

– where the HV gas-insulated transmission line is located, wholly or partly, in an area accessible to public;

– where the HV gas-insulated transmission line is long (typically longer than 500 m) and the typical gas

compartment length exceeds the common practice of GIS technology.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies.

For undated references, the latest edition of the referenced document (including any

amendments) applies.

IEC 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test

requirements
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance

IEC 60229:2007, Electric cables – Tests on extruded oversheaths with a special protective

function

IEC 60287-3-1:2017, Electric cables – Calculation of the current rating – Part 3-1: Operating

conditions – Site reference conditions

IEC 60376, Specification of technical grade sulfur hexafluoride (SF ) and complementary gases

to be used in its mixtures for use in electrical equipment
---------------------- Page: 11 ----------------------
SIST EN IEC 62271-204:2022
– 6 – IEC 62271-204:2022 © IEC 2022

IEC 60480, Specifications for the re-use of sulfur hexafluoride (SF ) and its mixtures in

electrical equipment
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013

IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications

for alternating current switchgear and controlgear

IEC 62271-203:2022, High-voltage switchgear and controlgear – Part 203: AC gas-insulated

metal-enclosed switchgear for rated voltages above 52 kV

IEC 62271-4:2013, High-voltage switchgear and controlgear – Part 4: Handling procedures for

sulphur hexafluoride (SF ) and its mixtures
ISO 9606 (all parts), Qualification test of welders – Fusion welding

ISO 9712, Non-destructive testing – Qualification and certification of NDT personnel

ISO 14732, Welding personnel – Qualification testing of welding operators and weld setters for

mechanized and automatic welding of metallic materials

ISO 15609 (all parts), Specification and qualification of welding procedures for metallic

materials – Welding procedure specification

ISO 15614 (all parts), Specification and qualification of welding procedures for metallic

materials – Welding procedure test
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 62271-1:2017 and

the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.101
area accessible to public
area accessible without restriction to any person

Note 1 to entry: A GIL installed above the ground and outside a substation is considered to be "installed in an area

accessible to public".
3.102
gas-insulated transmission lines
GIL

metal-enclosed lines in which the insulation is obtained, at least partly, by an insulating gas

other than air at atmospheric pressure, with the external enclosure intended to be earthed

3.103
GIL enclosure

part of GIL retaining the insulating gas under the required conditions protecting the equipment

against external influences and providing a high degree of protection to personnel

---------------------- Page: 12 ----------------------
SIST EN IEC 62271-204:2022
IEC 62271-204:2022 © IEC 2022 – 7 –
3.104
compartment

part of GIL totally gastight enclosed except for openings necessary for interconnection and

control
3.105
partition

gas tight support insulator of gas-insulated metal-enclosed switchgear separating two adjacent

compartments
3.106
main circuit

all the conductive parts of GIL included in a circuit which is intended to transmit electrical energy

[SOURCE: IEC 60050-441:1984, 441-13-02, modified – Replacement of “an assembly" by

“GIL".]
3.107
ambient air temperature

temperature, determined under required conditions, of the air surrounding the external GIL

enclosure in case of installation in open air, open trenches or tunnels

[SOURCE: IEC 60050-441:1984, 441-11-13, modified – Replacement of “complete switching

device or fuse" by “external GIL enclosure in case of installation in open air, open trenches or

tunnels".]
3.108
design temperature of the enclosure

maximum temperature which can be reached on a GIL enclosure under service conditions

3.109
design pressure of the enclosure
relative pressure used to determine the design of the enclosure

Note 1 to entry: It is at least equal to the maximum relative pressure in the enclosure at the design temperature of

the enclosure.
3.110
design pressure of the partitions
relative pressure across the partition

Note 1 to entry: It is at least equal to the maximum differential pressure across the partition during maintenance

activities.
3.111
disconnecting unit

unit to electrically isolate one side from another of the main circuit, mainly for site testing or

maintenance
3.112
disruptive discharge

phenomenon associated with the failure of insulation under electric stress, in which the dis-

charge completely bridges the insulation, reducing the voltage between the electrodes to zero

or almost zero

Note 1 to entry: The term applies to discharges in solid, liquid and gaseous dielectrics and to combinations of these.

Note 2 to entry: A disruptive discharge in a solid dielectric produces permanent loss of dielectric strength (non-self-

restoring insulation); in a liquid or gaseous dielectric, the loss can be only temporary (self-restoring insulation).

---------------------- Page: 13 ----------------------
SIST EN IEC 62271-204:2022
– 8 – IEC 62271-204:2022 © IEC 2022

Note 3 to entry: The term "sparkover" is used when a disruptive discharge occurs in a gaseous or liquid dielectric.

The term "flashover" is used when a disruptive discharge occurs over the surface of a solid dielectric in a gaseous

or liquid medium. The term "puncture" is used when a disruptive discharge occurs through a solid dielectric.

3.113
GIL section

part of GIL which is defined by operational or other requirements such as maximum length for

dielectric testing or installation sequence
Note 1 to entry: A GIL can consist on the assembly of several GIL sections.
Note 2 to entry: It can consist of one or more compartments.
Note 3 to entry: Sections can be segregated by disconnecting units.
4 Normal and special service conditions
4.1 Normal service conditions
4.1.1 General
Subclause 4.1.1 of IEC 62271-1:2017 is applicable with the following addition.

The normal service conditions which apply to a GIL depending on the installation conditions are

given in 4.101, 4.102 and 4.103. When more than one of these installation conditions apply, the

relevant subclause shall apply to each section of the GIL.
4.1.2 Indoor switchgear and controlgear
Subclause 4.1.2 of IEC 62271-1:2017 is applicable.
4.1.3 Outdoor switchgear and controlgear
Subclause 4.1.3 of IEC 62271-1:2017 is applicable.
4.2 Special service conditions
Subclause 4.2 of IEC 62271-1:2017 is applicable.
4.101 Installation in open air

For determining the ratings of GIL for open air installation, the normal service conditions of

IEC 62271-1:2017 shall apply. These are also valid for open trenches.

If the actual service conditions differ from the normal service conditions, the ratings shall be

adapted accordingly.
4.102 Buried installation
General values for thermal resistivity and soil temperature are:
– 1,2 K · m/W, and 20 °C in summer;
– 0,85 K · m/W, and 10 °C in winter.
For guidance, values given in IEC 60287-3-1 can be considered.

For long distance transmission lines (several kilometres), site measurement of soil resistivity

should also be considered.

NOTE 1 The use of controlled backfill with a given soil thermal resistivity can also be considered.

---------------------- Page: 14 ----------------------
SIST EN IEC 62271-204:2022
IEC 62271-204:2022 © IEC 2022 – 9 –

NOTE 2 A risk of thermal runaway exists if the soil surrounding the buried GIL becomes dry. In order not to dry out

the soil, a maximum service temperature of the enclosure in the range of 50 °C to 60 °C is generally considered

acceptable.

The depth of laying should be agreed between manufacturer and user. The determination of

depth of laying shall take into account thermo mechanical stresses, safety requirements and

local regulations.
4.103 Installation in tunnel, shaft or similar situation

Forced cooling is an adequate method to handle with the waste heat and can be used in case

of tunnel, shaft or similar installations.

In the case of long vertical shafts and inclined tunnels or sections thereof, attention shall be

paid to thermal and density gradients.
5 Ratings
5.1 General
Subclause 5.1 of IEC 62271-1:2017 is not applicable and is replaced as follows.
The rating of a GIL consists of the following:
a) rated voltage (U );
b) rated insulation level (U , U , U ;
d p s)
c) rated frequency (f );
d) rated continuous current (I );
e) rated short-time withstand current (I ) (for main and earthing circuits);
f) rated peak withstand current (I ) (for main and earthing circuits);
g) rated duration of short-circuit (t );
h) rated supply voltage of auxiliary and control circuits (U );
i) rated supply frequency of auxiliary and control circuits.
5.2 Rated voltage (U )
Subclause 5.2 of IEC 62271-1:2017 is applicable.
5.3 Rated insulation level (U , U , U )
d p s
Subclause 5.3 of IEC 62271-1:2017 is applicable with the following addition:

Rated insulation levels shall be chosen from IEC 62271-203 on the basis of insulation

coordination study for the specific installation in order to consider parameters like overvoltages,

voltage reflections, etc. Specific insulation coordination studies are recommended for each

...